Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

High-area polymer films with anti-reflective properties created with roll-to-roll plasma-etching

24.04.2012
Roll-to-roll plasma-etching creates nanostructures for favorable-cost modification of high-area polymer films with anti-reflective properties.
At the international vacuum conference SVC 2012 researchers of Fraunhofer FEP present the PolAR process: A method to provide high-area polymer films with anti-reflective properties.

Rain, darkness, the dazzling lights of an oncoming car - strong light reflection in such situations can be irritating or even become dangerous. Effective anti-reflection is not only important for spectacles and windshields, but also provides optimal light incidence for solar cells, solar heating panels, and triple glazing.
The Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena and the Fraunhofer Institute for Electron Beam and Plasma Technology FEP in Dresden have undertaken a joint project with industrial partners including Leica Microsystems, Rodenstock, and Southwall Europe. The project, entitled PolAR (reference 16/N0723), was funded by the Federal Ministry of Economics and Technology (BMWi) and aimed to develop a new, efficient, continuous roll-to-roll process for making large-area anti-reflecting polymer films.

The optimized plasma-etching process creates a structure on the polymer films, whose effect is based on the moth eye principle. The process enhances the base roughness of the polymer film and generates nanostructures, namely minute crests and troughs. As the nanostructures are smaller than the wavelength of visible light, they do not act as scattering centers and the film remains clear. At the same time, the structures cause the refractive index between the film and external medium to change continuously. That has the consequence that the optical reflection of, for example, PET film is reduced from 12% to 0.2%. Up until now this could only be achieved by complex coating of films with a four-layer anti-reflection system. The flexibility of, in particular, thin films is also adversely affected by the latter. Besides being useful for films, plasma-etching is also suitable for giving curved substrates anti-reflective properties.
Although the moth eye principle has been known for a long time, the Fraunhofer researchers have made a decisive technological breakthrough by generating nanostructures on large surfaces using a process that is suitable for mass production. In roll-to-roll pilot plants, like those used at the Fraunhofer FEP, kilometer-long films can be made anti-reflective at a rate of several meters per minute. Dual magnetron systems, which are usually used in industry for vacuum coating processes, provide an effective and stable ion current over several hours. Using these sources, the base process developed at the Fraunhofer IOF was transferred to high-area substrates at Fraunhofer FEP. The process has already been successfully used on PET films, triacetate cellulose (TAC) films, fluoropolymer films (ETFE), and lacquered films.

Interested parties can visit our booth (no. 904) at the SVC 2012 conference in Santa Clara (California / USA) from 1 May to 3 May to see the anti-reflective films.

Scientific contact:
Dr. Matthias Fahland
Fraunhofer Institute for Electron Beam and Plasma Technology FEP
Phone +49 351 2586-135
matthias.fahland@fep.fraunhofer.de

Press contact:
Annett Arnold
Fraunhofer Institute for Electron Beam and Plasma Technology FEP
Phone +49 351 2586-452
annett.arnold@fep.fraunhofer.de

Annett Arnold | Fraunhofer Institut
Further information:
http://www.fep.fraunhofer.de

More articles from Trade Fair News:

nachricht COMPAMED 2016 connected medical devices and people
23.11.2016 | IVAM Fachverband für Mikrotechnik

nachricht Successfully transferring Industrie 4.0 into reality
21.11.2016 | Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>